Automatic interlock



1-945. E. s. RUSSEY 2,356,655

AUTOMATIC INTERLOCK Filed July 19, 1941 2 Sheets-Sheet l Jan. 2, 1945.

E. s. RUSSEY AUTOMATIC INTERLOCK Filed July 19, 1941 2 SheetsSheet 2 fizyel d of ZZZ 1062712 jwczz'nfizasag Patented Jan. 2, 1945 d I STATES PATEN T OFFICE .Edwar d Swain Russey,'Muncie,ind., assignor to Borg-Warner Corporation chi cago', 111., a corporation ofIllinois IApplication Julyil9, 1941,. Serial No. 403,199

.6 Claims. (Cl..74'--1477) This invention relates to *transmissions, and particularly to an interlock mechanism therefor. The principal object of this invention is to provide an extremely simpleinterlockmechanism for a transmission which employs pivoted shifting elements instead of the usual slidable shift Another object of i this invention is to provide an interlockmechanism-which operates directly upon the pivoted shifting elements,

These-and other objectsrand featuresof this invention will become apparent from the following description and accompanying drawings, in

which: r 1 i Fig. 1 isa section in elevation of atra'nsmission to which this invention maybe appliedj Fig. 2 is a section through thetransmission taken alongline 2 2 of Fig. 1; i

Fig; sis asection through the transmission taken along line-*33-of Fig. 1; and

Fig. 4 is a front elevation in section takenalong lines 4-4 of Fig. 3 showing the interlock-mechanism. 1 r

Referring now to-thedrawings for a detailed description of the invention, and particularly to Fig. 1, the transmission is comprised of ,an input shaft lfl, an outputshaft H; and a countershaft indicated generallyat l2. Rotatable with input shafit lfl is a gear [3 which meshes with a gear 14 mounted on countershaft l2 and adaptedto drive said'countershaft through anoverrunning clutch l5; Rotatable withsaid countershaft. l2 is-a second speed gear lfi, a first speed gear I! and'a reversegear l8, Gears l6,"lland"I8 may be formed-integrally with countershaft 12 as cluster gears. Ing constant mesh with second speedgear l6 isa gear-"I9 whichis loosely mounted on output shaft l l. The right-hand end(Fig.

Also slidably splined on driven shaft H is a collar 22 which is provided with externalclutch teeth 23 engageable with internal clutch teeth 24 on gear l9 so as to comprise a positive jaw clutch connection between gear l9 and collar 22; A second jaw clutch. 25 is provided whichis comprised of a clutch sleeve 26 slidably splined to a hub 21 which may be integral with gear l9 so as .ual control (not shown).

to be rotatable therewith. Gear -l3 on input shaft lllis provided'with external clutch teeth 28 which may be engaged by slidable-sleevezfi to provide a positive jaw clutch connectionxbetween input shaft l0 and gear 19. l

The gear trains establishable through th transmission areas follows: i I

For reverse drive, gear 2| is movedto the right to engage the aforementioned reverseidler. Neutral and low speed forwardkare obtainedby-positioning sliding gear 2| .in theposition indicated and by engaging gear 2| with low speed gear 11 respectively. For all three of these conditions jaw clutch. 25 and collar22 must be movedto the right (Fig. 1) to disengage their respective clutch teeth. The gear. train for reverse is from gear l3 to gear 14, overrunning clutch. l5, countershaft [2, gear is and associatedidler, and gearfZLtodriven shaft II. For low speed the train includes gears l3 and l4,.overrunning clutch l5, countershaft l2 and. gears l1 and 2|. For secondspeedgear 2| is in its neutral position andcollar 22. is moved to the left so as. to engage teeth .23.with teeth. L .The gear train is then from gear [3 to gear I 4, overrunning clutchrli,

countershaft. l2, gear l6, gear; l-9,.and collar 2-2 to driven' shaft H. For direct drive sliding gear 2|"remains;in-neutral, collar 22 remains in its second .speed position and jaw clutch 25 is ent gaged so as to provideadirect connection between input shaft l0, gear [9, collar 2f21togdriven shaft-ll. l u

Thuspit is apparentgthat sliding gear 2| and collar 22 are mutually exclusively operable and must be so operated to avoid damage to the transmission. q

Referring nowyto the control mecha'nism forsliding gear 2| and provided with a groove 29 in whichis mounted a yoke 30. Said yoke 30 is secured to, or may be integral with, a shaft 3| which is mounted in a crank arm 32 of a rock shaft 33. Said rock shaft 33 is in turn adapted to be rotated by an external lever 34 which is connected to a suitable manual control (not shown). Similarly, sliding gear 21 is provided with an annular groove 35 in which rides a shift blade 36. Said blade 36 is secured to a shaft 36' which is mounted in a crank arm 31 of a rock shaft 38. An external lever 39 is secured to rock shaft 38, said lever 39 being likewise adapted to be connected to a manthe shafts for both yoke 30 and blade 36 extend Figs. 2 and 3 for details of. i

It will be noted that through their respective crank arms 32 and 31 and form projecting pins and 4| respectively.

Referring now to Fig. 4 for a detailed description of the interlock mechanism, it will be noted that pins 40 and 4| are bridged by a walking 1 with which each is to cooperate. The notches 44 and 45 are in the form of segments of circles, the center of curvature of notch 44 lying on the axis of rock shaft 33 and the center of curvature of notch 45 lying on the axis of rotation of rock shaft 38. The radius of curvature is so chosen that when pin 40 is in depression 46, pin 4| mine to. move along notch 45, and similarly, when pin 4| is in its depression 41 pin 40 is free to move along its notch 44. The location of the depressions with respect to the notches is such that either pin may be engaged by its respective depression when gear 2| and sliding collar 22 are in their neutral position. It is apparent, there plates having notches, and poppet means cooperating with the notches to position the shiftable elements. 5

3. A transmission unit as described in claim 1, the means rotatable with the shafts comprising plates having notches, and poppet means coopcrating with the notches to position the shiftable elements, each of said projections comprising an fore, that the interlock operates in such a manner as to prevent movement of sliding gear 2| when the jaw clutch controlled by collar 22 is to be operated, and vice versa.

Opposite crank 32 is a plate 48 which has two notches 49 and 5|) formed in the end thereof. A poppet 5| is adapted to engage notches 49 and 50 to locate crank 32 in the positions corresponding to the engaged (notch 49) and neutral (notch 50) positions of sliding collar 22. Similarly crank 31 is provided with a plate 52 which has notches 53, 54 and 55 formed in the end thereof. A-poppet 56 is adapted to engage notches 53, 54 and 55 to locate crank 31 in positions corresponding to low, neutral and reverse positions respectively of sliding gear 2|.

It is understood of course, that positive stops are provided for the pins 40 and 4| respectively by the ends of the notches as shown in dotted lines, This makes it unnecessary for poppets 5| and 56 to act as stops.

It is understood-that the foregoing description is merely illustrative of a preferred embodiment iii) of the invention and that the scope of the invention is not to be limited thereto but is to be determined by the appended claims.

I claim:

1. A transmission unit having shiftable elements, shafts for. controlling the elements, said shafts being rotatable about substantially parallel axes, means rotatable with the shafts; each means having a projection, and a pivoted bar having recesses to be engaged by the projections and being movable about its pivot by rotation of a projection about its shaft while engaging a reextension of one of said shiftable elements.

4. A transmission u'nit having shiftable elements, shafts for controlling the elements, said shafts being rotatable about substantially parallel axes, means rotatable with the shafts, a pin carried by each of said means and movable therewith, and a pivoted bar movable by the pins and having recesses to receive thepins, said bar being so pivoted that when one pin is moved out of its recess the other pinis locked, thereby providing an interlock for the shiftable elements, and said.

recesses being formed in arcuate surfaces in the bar, each surface, when its recess is free of its corresponding pin, having a center coinciding with the center of rotation of the shaft rotatable with said pin. a

5. A transmission unit having shiftable elements, shafts for controlling the elements, said shafts being rotatable about substantially parallel axes, means rotatable with the shafts, a pin carried by each of said means and movable therewith, and a pivoted bar having. recesses to receive the pins, said bar being so pivoted that when one pin is moved out of its recess the other pin is locked, thereby providing an interlock for the shiftable elements, and poppet means cooperable with the rotatable means to hold the freely rotatable shafts in any one of a plurality of positions.

6. A transmission unit having shiftable elements, shafts for controlling the elements, said shafts being rotatable about substantially parallel axes, means rotatable with the shafts, a pin carried by each of said means and movable therewith, and a pivoted bar having recesses to receive the pins, said bar being so pivoted that when one pin is moved out of its recess the other pin is locked, thereby providing an interlock for the shiftable elements, poppet means cooperable with the rotatable means to hold the freely rotatable shafts in any one of a plurality of positions, .and stop means for limiting the rotation of the shafts in either direction.

EDWARD SWAIN RUSSEY. 

